Lane splitting will limit the size ST, but the larger STs are considerably more comfortable for 2 up riding. The vfr 800 seems to fit the smaller ST bill. Also, Honda is clearing out the vfr1200 at really low prices. If a larger ST fits the bill, you can't go wrong with a Concours 14 or FJR. If money is not a big consideration, the BMW k1600 is very nice.